(19)

(11)

EP 2 537 238 A2

(12)

(88) Date of publication A3: 07.06.2012 (43) Date of publication: 26.12.2012 Bulletin 2012/52 (21) Application number: 11700268.3 (22) Date of filing: 13.01.2011

(51) International Patent Classification (IPC):  H02K 51/00(2006.01) H02K 49/10(2006.01) (86) International application number: PCT/EP2011/050375 (87) International publication number: WO 2011/098317 (18.08.2011 Gazette 2011/33)

(84) Designated Contracting States: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR (30) Priority: 15.02.2010 GB 201001864 (71) Applicant: Rolls-Royce Plc. London SW1E 6AT (GB)	(72) Inventor: EDWARDS, Huw Derby Derbyshire DE24 8BJ (GB) (74) Representative: Hartley, Andrew Colin et al Rolls-Royce plc SinB-38, P.O. Box 31 Derby DE24 8BJ Derby DE24 8BJ (GB)